Connecting the joints of air-heating pipes



JESSE YOUNG, OF FRANKLIN FURNACE, OHIO.

CONNECTING THE JOINTS OF AIR-HEATING PIPES.

Specicaton of Letters Patent No. 10,617, dated March 7, 1854.

T0 all whom, t may concern:

Be it known that I, JESSE YOUNG, of

Franklin Furnace, in the county of Scioto.

and State of Ohio, have invented a new and Improved Joint for Connecting Air-Heating Pipes; and I do hereby declare that the following is a full, clear, and exact description of the same, reference. being had to thel annexed drawings, making a part of this specification, in which- Figure 1 is an external view of my improved joint. Fig. 2 is a vertical section of ditto, the plane of section being through the center.

Similar letters of reference indicate corresponding parts in the two figures.

This invention relates to a new and improved joint for air heating pipes, whereby, owing to a peculiar form of construction, a perfectly tight joint is obtained bythe unequal expansion of two dierent metals of which the joint is formed.

The nature of my, invention consists in boring out or forming a recess at the connection or joint endsof the pipes, the recess be-V ing sufliciently large in diameter to receive a thimble, the inner diameter of which will correspond to the inner diameter of the pipes. The thimble is to be turned perfectly true on its outer side, and made of a metal more expansive than that of which the pipes are formed, so that when the thimble is heated it will expand and bind tight against the sides of the recesses and form a perfectly tight oint.

To enable others skilled in the art to fully understand and construct my invention, I

' will proceed to describe it.

A, A, represent the ends of two pipes, B, B, which are to be connected together. The ends are formed orv cast somewhat larger in diameter than the pipes, so as to allow recesses, (a), (a), to be bored in them, sufficiently large in diameter to receive a thimble, C, the inner diameter of which will correspond to the inner diameters of the pipes,.see Fig. 2. The ends, A, A, of the pipes are provided with iianches, D,

D, as shown in both figures. The outer surface of the thimble, C, is to be turned perfectly t-rue, and the thimble is to be formed of some metal more expansive than that of which the pipes are formed; for

instance, if the pipes are made of cast iron,` the thimble may be madeV of wrought iron'. It will readily be'seen that as the thimble,

c, is heated it will bear tightly against the sides of the recesses, (a), (a), because it is formed of a more expansive inetalthan the pipes, B, B, and consequently a perfectly tight joint is obtained.

The socket joints are commonly employedl for'connecting air heating pipes, but they vcannot be kept tight when exposed to a` high temperature, as the outside pipe being the largest and ldirectly exposed to the flame expands more than the inner andsmaller pipe. Flancli joints are imperfect, forthe4 reason that inhorizontal pipes bolts must be employed tosecure the tlanches together, andthe bolts, being 'nia-de of wrought iron,

will expand more than the .castironpipea i, Y,

and consequently as the pipes become yheated thebolts will expand more than the lanchesV i and allow the flanches to separate. This difficulty will not occur where flanch joints lconnect vertical pipes, because bolts need not be employed, the weight of' the upper pipe being sufiicientto keepthe iianches in l' contact with each other; but another1diffi` culty will occur, and that is, if the pipes:V differ a trifle from a vertical line the flanches will open vo-n one side. This is the casein the air heating pipes for hot blastvfurnaces, formerly patented by me. Owing to the ex; pansionof knobs, which serve to support annular pipes on one side, the flanch joints on the opposite side, vnot expanding so much, necessarily open at one side. The

objections to the socket` and fianch joints I have completely obviated, as my improved joint will allow the pipes to diifer a little from a vertical/line, suiciently so to com- Y pensate for any expansion of larger masses of metal forming supports to horizontal pipes opposite tothe joints.

expanding more than the pipes, bind tight 10 against the recesses, (a), (a), in which it `is fitted, and form a perfect tight joint, as

herein shown and described.

JESSE YOUNG.

Witnesses:

I. W. GLIDDEN, NANCY C. GILMAN. 

